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On Ubuntu trusty, I can't convert and DVD to the webm format. I'm using the command:

mencoder -v -v dvd://1 -ovc lavc -oac lavc -ffourcc VP80 -o output.webm -of lavf -lavfopts format=webm -lavcopts vcodec=libvpx -lavcopts acodec=vorbis

And get the error output:

94 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
ALLOCATED STREAM N. 1, type=0
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
Opening video filter: [scale w=480 h=-3]
SwScale params: 480 x -3 (-1=no scaling)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec.size: 0 x 0
INFO: libavcodec init OK!
Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
==========================================================================
Forcing output FourCC to 30385056 [VP80].
ALLOCATED STREAM N. 2, type=1
Building audio filter chain for 48000Hz/2ch/floatle -> 0Hz/0ch/??...
[libaf] Adding filter dummy 
[dummy] Was reinitialized: 48000Hz/2ch/floatle
[dummy] Was reinitialized: 48000Hz/2ch/floatle
Unsupported AVSampleFormat 8
Unsupported AVSampleFormat 8
Couldn't open codec vorbis, br=224.
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